共 7 条
[1]
CHAKRABORTY JN, 1932, INDIAN J AGR, V2, P516
[2]
The determination of clay in heavy soils
[J].
JOURNAL OF AGRICULTURAL SCIENCE,
1921, 11
:293-303
[3]
NOVAK V, 1932, P 2 INT C SOIL SCI, V1, P14
[4]
OLMSTEAD LB, 1930, USDA TECH B, V170
[5]
PURI AN, IN PRESS SOIL SCI
[6]
PURI AN, 1929, MEM DEP AGR INDIA CH, V10, P209